<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<title>Insert title here</title>
<style type="text/css">
	
	.red_container{ width: 200px; height: 200px; background: red; }
	.blue_container{ width: 200px; height: 200px; background: blue;  }
	.green_container{ width: 200px; height: 200px; background: green; }
	
	.child_in_red{ width: 50px; height: 50px; background: silver;  left: 50px; top: 50px;}
	.child_in_blue{ width: 50px; height: 50px; background: silver; left: 50px; top: 50px; }
	.child_in_green{ width: 50px; height: 50px; background: silver; left: 50px; top: 50px; }
	
</style>

</head>

<body>
	<div class="red_container">
		<div class="child_in_red"></div>
	</div>
	<div class="blue_container">
		<div class="child_in_blue"></div>
	</div>
	<div class="green_container">
		<div class="child_in_green"></div>
	</div>
</body>
</html>